This is civil engineering: Twin Tower Memorial

Twin Tower Memorial: On 13 March 2006, work on the Reflecting Absence design began. The budget was USD500-million.

Twin tower webImage credit: Joe Woolhead

In September 2008, construction workers raised the 3 500kg first column, near the footprint of the North Tower. A total of 8 300 tons of steel were installed and by April 2010, the reflecting pools were framed in steel, with 85% of the concrete poured. By April, installation of the granite coating for the reflecting pools began and by June, workers had begun granite installation in the South Pool. In July, the first soil shipments arrived and in August, tree planting began on the memorial plaza. Most of the memorial was finished for the 10th anniversary of the terrorist attacks, with the museum planned for completion one year later.

On 12 September 2011, one day after the 10th anniversary of the attacks, the memorial opened to the public.


 

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